High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs

J. R. Delorme; R. Galicher; P. Baudoz; G. Rousset; J. Mazoyer; M. N'Diaye; K. Dohlen; A. Caillat

doi:10.1117/12.2056846

28 July 2014 High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs

J. R. Delorme, R. Galicher, P. Baudoz, G. Rousset, J. Mazoyer, M. N'Diaye, K. Dohlen, A. Caillat

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91515Q (2014) https://doi.org/10.1117/12.2056846
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Direct imaging of exoplanets is very attractive but challenging. It requires high angular resolution and very high-contrast imaging. One solution is the use of coronagraphs behind the adaptive optics of large telescopes. Unfortunately, optics of space telescope and ground telescope introduce quasi-static aberrations which strongly limit the quality of the final image and a dedicated stage of adaptive optics is required. We proposed a self- coherent camera (SCC) in 2006 and we obtained contrast levels of (approximately equal to) 2 10^-8 at a few λ₀=D at 638 nm in laboratory. In this paper, we explain how to achromatize the SCC. We present laboratory performance in wide spectral band (approximately equal to) 5 - 10 % bandpass.

Citation Download Citation

J. R. Delorme, R. Galicher, P. Baudoz, G. Rousset, J. Mazoyer, M. N'Diaye, K. Dohlen, and A. Caillat "High-contrast imaging in wide spectral band with a self-coherent camera and achromatic coronagraphs", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515Q (28 July 2014); https://doi.org/10.1117/12.2056846

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